Sealing means for sheet metal containers



Dec. 31, 1935. c v 2,026,002

SEALING magma FOR SHEET METAL CONTAINERS Filed Jan. 16, 1934 'Zzbntor:

Patented Dec. 31, 1935 UNITED STATES 2,026,002 SEALING MEANS FOR ST METAL CONTAINERS armschmiaaaenia' Application January 18, 1934, Serial No. 106,863 In Germany January 16, 1933 2 Claims. 01. 220-61) I This invention relates to a sealfiig means for sheet metal containers.

It is already known for this purpose to em ploy a strip ring, which is placed over the cap 5 and engages with the neck of the container. This ring requires tobe resilient or expansible. To secure the ring in position on the neckof the container it has heretofore been necessary to employ a special tool, which folds over the .lower edge of the ring to such extent that the ring cannot be withdrawn. The manufacture of a ring of this nature is a relatively complicated matter whilst, as stated above, special means are required for its attachment.

This disadvantage is overcome according to same, and more particularly the lower edge thereof. requires to expand. According to the invention. a recess is provided in the cylin- 30 der jacket of the ring and extending to the lower edge. There may. however,- also be pro- 'vided a plurality of these recesses. 'lhe recess is situated in the cylinder jacket of the ring at the point of location of the strippin tab, which 35 latter adjoins the upper edge of the ring.

The recess accordingly fulfils a double purpose. The ring is able to expand in resilient fashion. whilst upon actuation of the stripping tab the upperedgeoftheringistornthroughinready '40 and simple fashion down to the reces in the Zltetflclzet portion for the purpwe of releasing the One or more mosses in the cylinder jacket of the ring are produced to the inven- 5 tion by the fact that the -out annular blank is cut away tangentially in a straight line at one or more points of its. circumference. If the width of the strip of metal from which the rings are and simultaneously drawn is 50 selected to be smaller than the diameter of the ring blank itself. there are formed in the finally drawn'ring the above referred to. One

single recess is sumcient at the point of location of the stripping tab. The strip of metal from 5g whlchthe blanksarecutisconduotedinthis case in such fashion below the stamping and drawing tool that the ring blank on the oneside of the'strip forms a tangent with the longltudinal edge of the strip, whilst the blank completed to form a discis cut away on,the other side in 5 segmental fashion by the opposite bounding edge.

of the strip.

The invention is illustrated by way of example in the accompanyin drawing, in which Fig. 1 shows a longitudinal section through '10 a seal equipped'with the sealing ring according to the invention.

, Fig.2 is a plan view of. the ring.

Fig. 3 is an elevation.

Fig.4isaplanviewofatmodifled 15 form of embodiment of the sealing ring. I

Fig. 5 shows ticallythe production of the sealing ring.

In the drawing I is the neck of a sheet metal container, for example a canister, which is closed byalidorcapieitherslippedovertheneckor. securedbyathread. Thelockingmeansforthis seal is constituted by' the cylindrical ring 3, which possesses at its lower edge an inwar directed groove 4. At its upper edge the ring is furnished with a stripping tab 5. which in the known manner may be furnished with a firm label, stamp or the like. Below the tab there is provided in the cylinder jacket of thering 3 a reces 6; The

neckofthecontainerlalsoatasuitable point an inwardly directed groove I. 1n.- place of this groove the-container may also be set off, or furnished with a projection.

When fitting the ring 8 in position on the neck of the container I the cylinder jacket of the ring expands,owingtotherece$6, tosuchextent that the ring, moved downwards, springs with its groovelintothegroove'lintheneck ofthecontainer l. Releaseofthe ringbymovementin the opposite direction olS imposible. By reason of 40 theringthe'capt iscovered. orinotherwords the seal secured. to such extent that the container cannot be opened until thesealing ring has been d. Upon the application of a tensileforcetothetabitheupperedgeofthe ringsandapartofthecylinderjaoketistornawaydowntotherecesstthatistosay-the pneviouswclosed ringisrelw'sedandmaybere moved from the neck of the container.

Fi 4 shows a somewhat modified form of em; bodimentofthe ring, the inneredgeof the ring, atthepointwberetheiabEadioinstheKmper edge of the ring 8, m; bent to a certain extent outwards to facilitate the it:

atthispoint 'lhemmeobjectalsobeaccomplished by providing an elevated or recessed portion at this point in the upper edge of the ring. I

The recess 6 in the ring is not specially cut or stamped out, but 'is produced upon the stamping and drawing of the ring, as illustrated in Fig. 5. The strip of metal 9, from which the rings are stamped and drawn in succession, possesses the widthb. The diameterof a ring blank, however, amounts to 17 If now b is 'made to be smaller than N, the ring blank is cut away at'ifl along a straight line, this portion forming the recess 6 upon the drawing of the ring. It is naturally also possible to employ a die or cutting tool to produce this straight portion, since as already stated there may be a plurality of recesses, and accordingly a corresponding number of straight cuts II).

It will be understood made to the particular forms of embodiment shown in the drawing, which have been quoted solely by 'wayof example, and that numerous embodiments are quite possible within the meaning 01' the above description and the annexed claims without departing from the spirit of the invention.

that no limitation is What I claim as new and desire to secure by Letters Patent is:

1. In a sealing device for sheet metal containers, a sealing ring adapted to fit over the lid of the container and engage with the neck of the 5 container, a groove about the lower edge of the said ring adapted to engage with 9. correspondingly shaped portion in the neck of the container, and a tab for tearing the said ring upon the application of a tensile force, the said ring 10 at the point situated below the said tab having 'a recess extending down to the lower edge of the ring.

2. In a sealing device for sheet metal containers, a sealing ring adapted to fit over the lid 15 of the container and engage with the neck of the container, an inwardly pressed groove about the lower edge of the said ring adapted to engage fully in a corresponding inwardly pressed groove in the neck of the said container, and a tab for 20 tearing the said ring upon the application of a tensile force, the said ring at the point situated below the said tab having a recess extending down tothe lower edge of the ring.

ERNST SCHMIDT. 

